1.5 Effect of change in priority date 

Certain time limits run from the date of priority, or in the case of multiple priorities, from the earliest date of priority. Where this date no longer applies (e.g. the right of priority is lost in accordance with the provisions of Art. 90(5)), any such time limits become determinable from the amended date of priority. This does not restore any loss of rights resulting from a time limit having already expired before the loss of priority date. For example, if a request for restoration of a priority right is filed upon entry into the European phase on expiry of the 31-month time limit under Rule 159(1) but the request is not granted resulting in the loss of the right of priority, the 31-month time limit will not be deferred. Part A of the Guidelines deals with the procedure to be followed (see A‑III, 6.9 to A-III, 6.11).